Everything You Need for a Flawless Sew-In.Get professional sew-in results with the right tools. These Weaving Needles & Threads for Sew-In Hair Extensions are the salon-trusted essentials for securing wefts cleanly, tightly, and durably. Whether you're a stylist or doing your own install, having the correct needle size and thread makes all the difference in a long-lasting, comfortable sew-in.Available Options Black Thread Combo Set - Includes needles and black thread for a complete, ready-to-use sew-in kit Brown Nylon Thread - Strong, flexible nylon thread ideal for securing wefts on brown or dark hair tones I Needle - 3½" Long - Longer straight needle for sewing through thick braids and multiple weft layers with ease J Needle - 2½" Long - Curved needle designed for precise, close-to-the-scalp stitching and tight weft attachment Key Benefits Salon-Quality Tools - Trusted by professional stylists for clean, secure sew-in installs Durable Nylon Thread - Strong enough to hold wefts firmly without cutting or fraying Two Needle Styles - I and J needles cover every sew-in technique and braid pattern Mix & Match - Purchase individually or as a combo set to stock your kit exactly as needed